DRILL & BLAST
TIME UTILISATION I
n addition to ‘as-drilled’ and ‘as-charged’ data, other data can be reported from these systems. For instance, Leica J2drill automatically detects the activity changes during the hole, which minimises operator-to-screen interaction. This function, as well as the manually entering of reasons for stoppages, enables Leica
Using a high-precision guidance system means a survey pickup is not required. T e guidance system performs the pickup in real-time and makes any necessary adjustments automatically, by providing the system with a toe position. T is is known as drilling to elevation and the guidance system will recalculate the target or required travel depth to achieve the correct toe elevation. T is is important when drilling to the correct horizon and avoiding drilling into the coal seam. Ideally, most coal mines want to have a small amount of hard toe by standing off the coal by a small amount. T is protects the coal seam during the blast, avoiding dilution of the overburden material with the coal seam. Drilling to elevation is also
important when the blast design requires a level bench as a result. High-precision guidance systems can
automatically compensate for diff erent elevations across the pattern and again adjust the target or travel depth to achieve a constant elevation. Once blasted, this will result in a fl at bench. T e resulting bench does not need to be fl at and other design parameters can be incorporated. A blast design can contain a sump that the guidance system will automatically recognise. T e system will indicate a new target depth to drill to without the operator spending time ascertaining whether they are in the correct location or not. Additionally, it is possible to take into account other features, such as bench drainage, etc.
Increased safety To improve the safety of the operator and avoid mishaps caused by pattern designs that do not fi t correctly to the actual environment, warning or hazard zones can be placed into the
J2drill to provide time utilisation data to improve practices in drilling operations. By analysing where delays occur, and by putting actions into place to address these occurrences, the drilling process can be further optimised. This too can be equally applied to the equipment involved in the blast process. ●
T
he second generation Leica Jigsaw platform links three key levels of mining operations: fl eet management; high precision guidance; and autonomous control
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